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SSL Certificate Checker: Expiry, Issuer, Chain, TLS

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Check SSL/TLS certificates for any list of domains: days until expiry, issuer, whether it covers the host name, trusted chain, self-signed, TLS version, cipher, key type and all subject alternative names. Great for expiry monitoring on a schedule.

Pricing

Pay per event

Rating

0.0

(0)

Developer

Dodge Sucharda

Actor stats

Bookmarked

Total users

Monthly active users

22 days ago

Last modified

Good for

Expiry monitoring: schedule it daily or weekly on your domains and alert on daysLeft (use Apify's schedules and integrations)
Agencies and IT teams: audit every client site at once
Security reviews: find self-signed, mismatched or old-TLS endpoints
Inventory: list which certificate authority each domain uses

Output (one row per host; real result from 30 Sep 2026, shortened)

{
  "host": "apify.com",
  "port": 443,
  "status": "ok",
  "valid": true,
  "daysLeft": 108,
  "validTo": "2027-01-16T23:59:59.000Z",
  "issuer": "Amazon",
  "issuerCommonName": "Amazon RSA 2048 M04",
  "coversHost": true,
  "trusted": true,
  "selfSigned": false,
  "protocol": "TLSv1.3",
  "keyType": "RSA 2048",
  "sanCount": 4,
  "subjectAltNames": ["*.apify.com", "apifier.com", "*.apifier.com", "apify.com"],
  "issues": []
}

valid is false when there is any error: expired, expiring within 7 days, not yet valid, host name not covered, self-signed, or an untrusted chain. expires_soon (within your warning window, default 30 days) and old TLS versions are warnings.

Input

Hosts: domains or URLs, optionally with a port (mail.example.com:993 works for any TLS service).
Warn when expiring within (days): default 30.

Limits

It reads the certificate the server presents for the host name you give (SNI). It does not scan every server behind a load balancer.
It does not check revocation (OCSP/CRL).

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